Quantum fluctuations stabilize skyrmion textures
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http://hdl.handle.net/10045/54255
Títol: | Quantum fluctuations stabilize skyrmion textures |
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Autors: | Roldán-Molina, A. | Santander, M.J. | Núñez, A.S. | Fernández-Rossier, Joaquín |
Grups d'investigació o GITE: | Grupo de Nanofísica |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales |
Paraules clau: | Spin waves | Quantum fluctuations | Skyrmion textures |
Àrees de coneixement: | Física de la Materia Condensada |
Data de publicació: | 23-de desembre-2015 |
Editor: | American Physical Society |
Citació bibliogràfica: | Physical Review B. 2015, 92: 245436. doi:10.1103/PhysRevB.92.245436 |
Resum: | We study the quantum spin waves associated to skyrmion textures. We show that the zero-point energy associated to the quantum spin fluctuations of a noncollinear spin texture produce Casimir-like magnetic fields. We study the effect of these Casimir fields on the topologically protected noncollinear spin textures known as skyrmions. In a Heisenberg model with Dzyalonshinkii-Moriya interactions, chosen so the classical ground state displays skyrmion textures, we calculate the spin-wave spectrum, using the Holstein-Primakoff approximation, and the associated zero-point energy, to the lowest order in the spin-wave expansion. Our calculations are done both for the single-skyrmion case, for which we obtain a discrete set of skyrmion bound states, as well as for the skyrmion crystal, for which the resulting spectrum gives the spin-wave bands. In both cases, our calculations show that the Casimir magnetic field contributes up to 10% of the total Zeeman energy necessary to delete the skyrmion texture with an applied field. |
Patrocinadors: | The authors acknowledge funding from Fondecyt Grant No. 1150072, Grant No. ICM P10-061-F by Fondo de Innovación para la Competitividad-MINECON, and Anillo Grant No. ACT 1117. A.S.N. also acknowledges support from Financiamiento Basal para Centros Científicos y Tecnológicos de Excelencia, under Project No. FB 0807(Chile). |
URI: | http://hdl.handle.net/10045/54255 |
ISSN: | 0163-1829 (Print) | 1095-3795 (Online) |
DOI: | 10.1103/PhysRevB.92.245436 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2015 American Physical Society |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1103/PhysRevB.92.245436 |
Apareix a la col·lecció: | INV - Grupo de Nanofísica - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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2015_Roldan_etal_PhysRevB.pdf | 1,39 MB | Adobe PDF | Obrir Vista prèvia | |
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